ModelCraft foundation: workspace, quality gates, FE model, command engine, geometry boundary

A pure-Rust CAE modeling workspace following the SolidCraft conventions:
- modelcraft-model: nodes and elements by label with hostile-input validation
- modelcraft-geometry: SolidCraft's kernel (pinned git dependency) behind our own API;
  tessellation into a face-tagged boundary surface for volume meshing
- modelcraft-engine: CommandSpec registry, Session::execute with rollback and panic guard,
  scripts and a journal
- modelcraft-cli: list commands, run scripts
- xtask: layers (only geometry may use solidcraft-*), assets, licences, tests, wasm, ci
- AGENTS.md, architecture, ADR 0001 (libraries and licences), roadmap, CI

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm

xtask/src/test.rs

@@ -0,0 +1,105 @@
+//! `cargo xtask test`: build the workspace's tests once, then run every test binary at the same
+//! time. `cargo test` runs them one after another, so one slow binary held up all the others;
+//! the doc tests and any other `side` jobs run alongside on their own thread.
+
+use std::process::{Command, Stdio};
+use std::sync::mpsc;
+use std::time::Instant;
+
+use crate::{cargo, root};
+
+/// A test executable from `cargo test --no-run`.
+struct TestBin {
+    label: String,
+    exe: String,
+    dir: String,
+}
+
+/// Build the tests with `cargo_args` (e.g. `--locked`), run each binary with `test_args`, and run
+/// the `side` jobs one after another meanwhile. Each prints a line when it ends; a failure prints
+/// its whole output.
+pub fn run(cargo_args: &[&str], test_args: &[&str], side: Vec<(String, Command)>) -> Result<(), String> {
+    let bins = build(cargo_args)?;
+    let start = Instant::now();
+    let (tx, rx) = mpsc::channel::<(String, Result<String, String>, f64)>();
+    let mut failed = Vec::new();
+    std::thread::scope(|scope| {
+        for b in &bins {
+            let tx = tx.clone();
+            scope.spawn(move || {
+                let t0 = Instant::now();
+                let mut c = Command::new(&b.exe);
+                c.args(test_args).current_dir(&b.dir).env("CARGO_MANIFEST_DIR", &b.dir);
+                let _ = tx.send((b.label.clone(), finish(c), t0.elapsed().as_secs_f64()));
+            });
+        }
+        let tx_side = tx.clone();
+        scope.spawn(move || {
+            for (label, c) in side {
+                let t0 = Instant::now();
+                let _ = tx_side.send((label, finish(c), t0.elapsed().as_secs_f64()));
+            }
+        });
+        drop(tx);
+        for (label, result, secs) in rx {
+            match result {
+                Ok(summary) => println!("ok    {label:<44} {secs:6.1}s  {summary}"),
+                Err(output) => {
+                    println!("FAIL  {label:<44} {secs:6.1}s\n{output}");
+                    failed.push(label);
+                }
+            }
+        }
+    });
+    println!("test: {} binaries in {:.1}s", bins.len(), start.elapsed().as_secs_f64());
+    if failed.is_empty() { Ok(()) } else { Err(format!("failed: {}", failed.join(", "))) }
+}
+
+/// Run to the end: the last `test result:` line on success, all output on failure.
+fn finish(mut c: Command) -> Result<String, String> {
+    let out = c.stdin(Stdio::null()).output().map_err(|e| format!("failed to spawn: {e}"))?;
+    let stdout = String::from_utf8_lossy(&out.stdout);
+    if out.status.success() {
+        Ok(stdout.lines().rev().find(|l| l.starts_with("test result:")).unwrap_or("").trim_start_matches("test result: ").to_string())
+    } else {
+        Err(format!("{stdout}{}\n({})", String::from_utf8_lossy(&out.stderr), out.status))
+    }
+}
+
+/// `cargo test --workspace --profile ci --no-run`, and the executables it built.
+fn build(cargo_args: &[&str]) -> Result<Vec<TestBin>, String> {
+    let mut c = cargo();
+    c.args(["test", "--workspace", "--profile", "ci", "--no-run", "--message-format=json-render-diagnostics"]).args(cargo_args);
+    eprintln!("$ cargo test --workspace --profile ci --no-run");
+    let out = c.stderr(Stdio::inherit()).output().map_err(|e| format!("cargo test --no-run: failed to spawn: {e}"))?;
+    if !out.status.success() {
+        return Err(format!("cargo test --no-run: exited with {}", out.status));
+    }
+    let mut bins: Vec<TestBin> = Vec::new();
+    for line in String::from_utf8_lossy(&out.stdout).lines() {
+        let Ok(m) = serde_json::from_str::<serde_json::Value>(line) else { continue };
+        let Some(exe) = m["executable"].as_str().filter(|_| m["reason"] == "compiler-artifact" && m["profile"]["test"] == true) else {
+            continue;
+        };
+        if bins.iter().any(|b| b.exe == exe) {
+            continue;
+        }
+        let manifest = std::path::Path::new(m["manifest_path"].as_str().unwrap_or_default()).to_path_buf();
+        let dir = manifest.parent().map(|d| d.to_path_buf()).unwrap_or_else(root);
+        let pkg = dir.file_name().map(|n| n.to_string_lossy().into_owned()).unwrap_or_default();
+        let kind = m["target"]["kind"][0].as_str().unwrap_or("");
+        let label = format!("{pkg} {kind} {}", m["target"]["name"].as_str().unwrap_or(""));
+        bins.push(TestBin { label, exe: exe.to_string(), dir: dir.to_string_lossy().into_owned() });
+    }
+    if bins.is_empty() {
+        return Err("cargo test --no-run built no test executables".into());
+    }
+    Ok(bins)
+}
+
+/// The doc tests (`cargo test --doc`), to run as a side job.
+pub fn doc_tests(cargo_args: &[&str], test_args: &[&str]) -> (String, Command) {
+    let mut c = cargo();
+    c.args(["test", "--workspace", "--profile", "ci", "--doc"]).args(cargo_args).arg("--").args(test_args);
+    ("doc tests".into(), c)
+}